Pliers



(No Model.)

A. A. LOW.

PLIERS.

No. 419,270. v Patented Jan. 14, 1890'.

N. Ptrzns. Pholwhthognpher. Washington. nc.

UNITED STATES PATENT OFFICE.

ABBOT AUGUSTUS LOWV, OF BROOKLYN, NEW YORK.

PLIERS.

SPECIFICATION forming part Of Le'l'ltels Patent N0. 419,270,

Application filed February 27, 1889- Serial No. 301,397-

To all whom it mag concern:

' upon the article to be to rotate the device the Be it known that I, ABBOT Aueus'rus Low, a citizen of the United States, residing in the city of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Implements for Imparting Rotary Motion, of which the following is a specification sufficient to enable others skilled in the art to which the invention appertains to make and use the same.

My invention relates to implements for grasping and rotating clock-spindles and similar articles requiring winding or tightening, and is designed to afford a simple, compact, and eitective device adapted to compensate for variations in the size of the spindles or other objects operated upon.

The leading'feature of my invention consists in so arranging the parts of the device that the strain thereon in use tends constantly to tighten the gripping-jaws upon anything introduced between themthat is to say, the mere act of rotating the device secures it operated upon in such manner that the greater the force employed more rigid and effective will be its connection therewith.

The invention consists in two levers pivotally connected, the short arms of which are formed into gripping jaws, while the long arms are formed the one with an inclined plane extending diagonally across the longitudinal axis of the implement, and the other lever with an actuatingscrew the axis of which coincides with or is substantially parallel to the said longitudinal axis of the implement in such manner that the rotation of the screw forward tends constantly to close the jaws. The head or handle of the actuatin "-screw may thus be used practically as the handle of the implement during its rotation,- insuring a continuous firm hold upon the article operated upon,which increases in effectiveness in proportion to the requirements or necessityin other words, in proportion to the amount of resistance encountered and the consequent increase of power applied.

An important advantage arising from my special construction and arrangement of parts consists in the ease and rapidity with which the implement may be applied to or disengaged from an object, the pitch of the inclined The action 0 dated January 14, 1890.

(No model.)

bearing-surface against which the actuatingscrew rests rendering a partial turn of the latter sufficient to tighten or loosen the jaws to the requisite degree.

In the accompanying drawings I show an implement embodying my improvements in practical form, although Ido not wish to confine myself strictly to the identical construction of parts shown, since it is obvious that various modifications maybe resorted to without deviating materially from the essential features of my invention.

Figure 1 isa side elevation of my improved rotating implement, showing the actuatingscrew partially retracted and the grippingjaws opened to a corresponding degree. Fig. 2 is a similar view showing the screw advanced and the gripping-jaws closed upon the end of a spindle. Fig. 3 is an edge or top view of the device.

The levers A and B cross each other at the pivot or fulcrum C, so that the gripping-jaws a and I) approach or recede from each other simultaneously with the drawing together or separation of the levers A and B.

Of course it is obvious that myimprovements in construction may be applied to any ordinary form of pliers, nippers, or clamping device having fiat, round, or other special form of jaws, although I havedesigned them more especiall Y for the production of a substitute device for the ordinary cloclckey, and for rotating or tightening articles that are square in cross-section; and I have consequently indicated the jaws to b as formed to conform to the angular head (1 of the spindle D, as shown in Fig. 2, althoughI do notclaim or limit myself to such shape of grippingsurfaces.

A spring E, attached to the inner side of one lever and bearing against the inner side of the opposite lever, tends constantly to separate the levers A and B, and consequently the gripping-jaws co and l) in like proportion. spri g E is limited and controlled by the' ring of the inner d 7 of the actuating s'crew F against the inclined surface a of the diagonally-projecting spur or abutment a, forming part of the lever A, from the inner side of which it projects diagonally across the longitudinal axis of the said actuating-screw F, as shown in Figs. 1 and 2 of the drawings. The forcible impingement of the endfof the screw F against the bearing-surface a of the abutment a causes the levers A and B and the jaws a and Z) to close more 01' less rapidly, according to the pitch or inclination given to the said inclined bearing-surface a In like manner the power of the device may be increased or diminished by varying the angle of lateral projection of the inclined plane (1, with relation to the path or longitudinal axis of the actuating-screw F. In fact it will be seen that I combine all the advantages of the inclined plane and screw in my arrangement and at the same time render the device almost instantaneous in action, so that no loss of time or inconvenience is eX- perienced in the use of the implement, while it adapts itself readily and automatically to any variations in the size of the several articles to which it may be applied.

The cross-head f of the actuating-screw F is made sufliciently broad and large to afford a convenient hold for the fingers, and is designed to be used, as before indicated, as the handle of the implement during operation,

l l l i the application of the power to effect the rotary movement through the screw itself insuring a close fit of the jaws a and b and a tenacious hold upon the article operated upon.

The end of the lever B is preferably turned up to form a bearing Z), which is tapped with a female screw-thread for the reception and engagement of the screw F, which latter may be either of the right-handor left-hand variety, according to the circumstances of use for which a particular implement may be designed.

hat I claim as my invention, and desire to secure by Letters Patent, is

The combination, in an implement substantially such as described, of the pivotally-eonnected levers A B, having the gripping-jaws a l), the laterally-projecting rigid spur a, having the inclined plane a and the actuatingscrew F, arranged to impinge against the said inclined plane, substantiaily in the manner and for the purpose described.

ABBOT AUGUSTUS LOW. \Vitnesses:

Geo. W. MIATT, D. W. GARDNER. 

